I saw the doctor_____ in the city of Shanghai last year. Maybe he comes from Shanghai.
A:anywhere
B:everywhere
C:here and there
D:somewhere
如图,在Rt△ABC中,∠ACB=90°,D、E、F分别是AB、BC、CA的中点,若CD=3cm,则EF=____cm.
鸡有蛋鸡、肉食鸡、草鸡等多个品种,它们都属于( )
建国以来党的历史上具有深远意义的伟大转折是: